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The P-75 has me looking up German WWII bombers. It was a fun Rabbit hole to go down.
The second one with the skids makes me think of this one:
The second one with the skids makes me think of this one:

Such small wheels, completely upright design. Can't go very fast. Either for a helicopter, or, my guess is for the Lunar Landing Research Vehicle.
I'm guessing this is a prop driven VIP or utility plane from the 60s. I'm having difficulties placing it though. It reminds me in a way of the Lockheed P-80 and Bell P-59, so maybe a very early generation jet may fit too. Nothing I've looked at matches, though, so... no guesses here.
Nice finds, though more exotic than my knowledge or intuition would allow to pinpointTop pic is the XV-6 Kestrel, baby Harrier.
Bottom one, you're on the right track. Rockwell Aero Commander, forget the AF designation right now, used as a VIP/presidential transport.